SAMPLE ASOC EXAM QUESTION PAPER SECTION-A

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1 Time for General Grade : 2 hours Time for Restricted Grade : 1 hour Max marks for both grades : 100 SAMPLE ASOC EXAM QUESTION PAPER Instructions 1. There will be 2 sections in the question paper. Each section contains 50 questions. All questions carry equal marks. All the candidates are required to write the answers for the questions in the box provided for each of the respective questions. 2. Candidates appearing for General grade should answer all the questions. 3. Candidates appearing for Restricted grade should answer only first 25 questions from each of the section. SECTION-A 1) Parameter that determines lowest signal reception capability of a receiver is a) Sensitivity b) Fidelity c) Selectivity d) Squelch 2) TRF stands for a) Turning radio frequency b) Turning rod frequency c) Tuned radio feed d) Tuned radio frequency 3) If a super hetero dyne radio receiver is tuned to 1255 KHz & the IF frequency is 455KHz, then the frequency of the local oscillator of the receiver is a) 1255 KHz b) 800 KHz c) 1710 KHz d) 455 KHz 4) Kirchhoff s voltage Law states that a) The sum of voltages in a loop is zero b) The algebraic sum of voltages in a loop is zero c) The sum of currents at a junction is zero d) The algebraic sum of currents at a junction is zero 5) Among all these materials, which one has poor conductivity? a) Copper b) Aluminum c) Silicon d) Silver

2 6) A magnet does not attract which one in the following a) Nickel b) Aluminum c) Iron d) Cobalt 7) The unit of resistance is a) Mho b) Volts c) Ampere d) Ohm 8) The expanded form for LDR is a) Light Emitting Display b) Low Dependent Reading c) Light Emitting Diode d) Light Dependent Resistor 9) The three leads of a common transistor are a) Base Collector Case b) Emitter Collector Bias c) Collector Base Omitter d) Collector Base Emitter 10) If R is resistance, I is current and V is voltage, then Ohms law states that a) R=V/I b) I=R/V c) V=R/I d) V/(R/I)=1 11) If two capacitors are placed in series, is the final capacitance will be: a) Higher than the sum of the two capacitors b) Lower than the least of the two capacitors c) The sum of the two capacitors d) Cannot be determined the given data. 12) Which is the unit of energy in electronics? a) Ohm b) Ampere c) Joules d) Watt 13) The high frequency band (HF) is a) 3KHz to 30KHz b) 3MHz to 30MHz c) 30KHz to 300KHz d) 30MHz to300mhz

3 14) Among the following which is not a directional antenna a) Whip antenna b) Yagi-Uda antenna c) Loop antenna d) Dish antenna 15) The unit of current is a) Volts b) Ampere c) Watt d) Hertz 16) If a small value of inductance is connected in parallel with a large value, the combined inductance will be a) The same b) Higher c) Lower d) Cannot be determined with the given data. 17) The equivalent capacitance when three capacitors of 150 micro farad are connected in series is a) 450 micro farad capacitor b) 300 micro farad capacitor c) 150 micro farad capacitor d) 50 micro farad capacitor 18) A resistor with color bands: Red-Violet-Orange-Silver, has the value of a) 23 kilo Ohm, 5% tolerance b) 27 kilo Ohm, 5% tolerance c) 2.7 kilo Ohm, l0%tolerance d) 27 kilo Ohm, 10% tolerance 19) The abbreviation of RMS voltage is a) Railway Mail Service voltage b) Real Mean Square voltage c) Root Mean Square voltage d) Root Mean Service voltage 20) If the peak voltage of a sinusoidal ac supply is 150 volts, the RMS value is a) Less than peak value b) More than peak value c) Equal to peak value d) Not related to peak value of the voltage

4 21) A capacitor and inductor in series is called a a) Tuned Circuit b) Timing Circuit c) Delay Circuit d) Schmitt Circuit 22) A domestic inverter a) Converts ac to ac b) Converts ac to dc c) Converts dc to ac d) Converts dc to dc 23) The current in a circuit is 25mA, then the equivalent value is a) Ampere b) Ampere c) Ampere d) 0.25 Ampere 24) If 2 ma current flows through a 100 Kohm resistor, then the voltage across it is a) 2 volts b) 20 volts c) 200 volts d) 0.2 volts 25) The tolerance bands with colors gold, silver & brown represent a) 5%, 10%, 2% b) 5%, 10%, 1% c) 10%, 5%, 1% d) 10%, 5%, 2% 26) India uses which encoding technique for commercial TV broad cast a) NTSC b) SECAM c) PAL d) None of the above 27) The video bandwidth in a TV transmission in India is a) 455 KHz b) 10.7 MHz c) 4.2 MHz d) 5.5 MHz

5 28) Sky wave propagation utilizes a) Troposphere b) Stratosphere c) Ionosphere d) Exosphere 29) Ionosphere does not have layer. a) C b) D c) E d) F 30) Which layer of ionosphere disappears during night time? a) C b) D c) E d) F 31) In dealing with sky/ground wave propagation, the area of silence where no signals are received is the a) dead zone b) skip distance c) skip zone d) propagation distance. 32) Frequencies lesser than the critical frequency are a) passed into space b) the most desirable c) returned to earth d) refracted by the F2 layer 33) For mobile communications, the up-link frequency is down link frequency. a) Less than b) More than c) Equal to d) Less or more than the 34) All India Radio (AIR) does not broadcast a) Amplitude Modulation transmission b) Frequency Modulation transmission c) Pulse Modulation transmission d) Both a and b

6 35) A diode can be used in the following stages of a radio receiver a) Detector b) Mixer c) Rectification d) All of the above 36) Geo stationary orbit is km away from the earth a) 3100 b) c) d) ) Which antenna is used for direction finding purpose? a) Loop antenna b) Active Whip antenna c) Whip antenna d) Dipole antenna 38) A transformer converts a) AC voltage into DC voltage b) DC voltage into AC voltage c) AC voltage into different AC voltage d) DC voltage into different DC voltage 39) A matching transformer (10:1 turns ratio) is used to match 200 ohms into ohms. a) 2 b) 20 c) 200 d) 5 40) The following are transformer losses a) Hysteresis losses b) Eddy current losses c) Copper losses d) All of the above 41) Digital modulation techniques are a) Amplitude modulation b) Frequency modulation c) Phase shift keying

7 d) Phase modulation 42) The following idle component dissipates energy a) Capacitor b) Inductor c) Resistor d) All of the above 43) The most common stage used for amplifying an electrical signal is a) Common Base b) Common collector c) Common emitter d) Emitter follower 44) The biasing of a transistor is to a) To avoid thermal run away b) To provide stable operation c) To have a stable quiescent point d) All of the above 45) The ideal value of ripple factor should be a) 0 b) 1 c) d) ) The full wave rectifier employs a) 1 diode b) 2 diodes c) 3 diodes d) 4 diodes 47) The following is used as a Voltage smoothing device a) Resistor b) Capacitor c) Inductor d) Both a and b 48) The following modulation is used for audio transmission in TV broadcast a) Amplitude modulation b) Frequency modulation c) Pulse modulation d) None of the above

8 49) NICAM technique is used in TV broadcast a) For transmitting video b) For transmitting mono aural audio c) For transmitting stereo audio d) For transmitting timing signals 50) Conventional Facsimile machine sends data over media a) Analog, air b) Digital, air c) Analog, telephone d) Digital, telephone SECTION-B 51) Under Indian Wireless Telegraph rules, 1973, the minimum age to work on a radio transmitting apparatus is years a) 12 b) 15 c) 18 d) 21 52) An amateur is forbidden to transmit a) communications of business b) transmissions of entertainment value or music c) advertisements d) all the above 53) Log containing chronological record of all transmissions should be preserved for a) 1 day b) 1 month c) 6 months d) 12 months 54) Log containing chronological record of all transmissions should contain a) Date and time of all transmissions b) Call sings intercepted c) Summary of communications d) All of the above

9 55) Which of the following should be given top priority? a) Safety signal b) Routine communication signal c) Distress signal d) Urgency signal 56) The following is not an amateur call sign of India a) VU2XYZ b) VU3ABC c) VU44AB d) VU3RS 57) The standard time & frequency signal in India is a) 5 MHz b) 10 MHz c) 20 MHz d) 100 MHz 58) The standard time & frequency signal in India call sign is a) VU2 b) VU3 c) ATA d) ATU 59) The abbreviation for end of message in Morse code is a) AA b) AR c) ED d) EN 60) QTR stands for? a) What is the correct time? b) What is your position in latitude and longitude? c) Thank you for sending d) What is Time and Hour? 61) The standard emission designation consists of a) 8 letters/numerals b) 3 letters/numerals c) 6 letters/numerals

10 d) 2 letters/numerals 62) Metric waves means a) 3-30 MHz b) 3-30 KHz c) KHz d) MHz 63) The standard bandwidth designation consistsof a) 5 letters/numerals b) 3 letters/numerals c) 4 letters/numerals d) 2 letters/numerals 64) Which should be used as a suffix in call sign for mobile amateur stations a) ME b) MB c) MO d) ML 65) The Q code for What is the correct time is a) QCT b) QTM c) QRT d) QTR 66) The Q code for Are my signals fading? is a) QSB b) QAM c) QSI d) QSF 67) The Q code QRQ represents a) Shall I stop slowing? b) Shall I increase power? c) Shall I send faster? d) Shall I decreasepower? 68) The Phonetic alphabet for L is a) Lilly b) Lima c) Limca d) Lisa

11 69) The Phonetic for 3 is a) Terra Three b) Tele Three c) Tango Three d) Tango Tree 70) The expanded from for AA in Morse code is a) End of line b) End of message c) End of transmission d) End of signal 11) The expanded form for TU in Morse code is a) Thank u b) Thank you c) Thank everyone d) None of the above 72) The expanded form for CQ in Morse code is a) Calling you b) Calling any station c) Calling Quebec d) Calling none 73) The abbreviation for stand by in Morse code is a) SY b) AS c) SB d) AD 74) The Q code for What is the name of your station? is a) QNS b) QRA c) QYS d) QNA 75) The Q code for Are you ready? is a) QRY b) QRV c) QAR d) QRE

12 76) The expanded from of SOS is a) Save our selves b) Save one self c) Save one souls d) Save our souls 77) The distress signal in radio telephony is a) Help, Help, Help b) May day. May day, May day c) Save, Save, Save d) Save our souls 78) The phonetic for alphabet Y is a) Yardly b) Yankee c) Yan d) Yarn 79) The phonetic for 9 is a) New Nine b) Nove Nine c) Novel Nine d) Nine 80) Which one of this is not a standard frequency signal a) l5 MHz b) l0 MHz c) 5 MHz d) 1 MHz 81) The renewal fee for General Grade Amateur license under new rules is a) Rs 1000 b) Rs 2000 c) Rs. 100 d) Rs ) The fee for mobile endorsement under new rules is a) Rs 100 b) Rs. 200 c) Rs d) Rs. 2000

13 83) The maximum DC power permitted under new rules for Restricted grade amateurs under MHz band is a) 10 watts b) 25 watts c) 50 watts d) 100 watts 84) The maximum DC power permitted under new rules for General grade amateurs under KHz band is a) 50 watts b) 100 watts c) 200 watts d) 400 watts 85) The permitted emission under new rules for Restricted grade amateurs under 144-l46 MHz band is a) A3E b) J3E c) F3E d) AlA 86) The first symbol in the designation for classification of emission represents a) Nature of signals modulating the main carrier b) Type of modulation of the main carrier c) Type of information to be transmitted d) None of the above 87) Emission designation of commercial FM broadcast transmission in India is a) ME b) J3E c) F3E d) R3E 88) Conventional Morse code transmission can be represented by a) J3E b) F3E c) ME d) AlA

14 89) The second symbol in the designation of emission represents a) Nature of signals modulating the main earner b) Type of modulation of the main carrier c) Type of information to be transmitted d) None of the above 90) The following frequency band is permitted for general grade amateurs only a) KHz b) KHz c) MHz d) KHz 91) The fee for change of location new rules is a) Rs. 100 b) Rs. 200 c) Rs. 500 d) Rs ) The maximum DC power permitted under new rules for General grade amateurs under MHz band is a) 10 watts b) 25 watts c) 50 watts d) 100 watts 93) The standard designation for a bandwidth of 4.8 KHz is a) 4800 Hz b) 4K8 c) 4K80 d) ) A bandwidth of 402 M represents a) 4000 MHz b) 402 MHz c) 4.2 MHz d) 420 MHz 95) The emission C3F denotes a) Single side band analog audio emission b) Common analog radio emission c) Vestigial sideband analog TV emission

15 d) Vestigial sideband digital TV emission 96) The expanded form for RST is a) Readability signal tone b) Readability strength tone c) Readability strength testing d) Readability signal strength tone 97) The phonetic for W is a) Wine b) White c) Whiskey d) Wheel 98) The UHF band extends from a) 3-30 KHz b) MHz c) 3-30 MHz d) MHz 99) Which of the frequency bands was not allocated for Amateur service a) KHz b) KHz c) KHZ d) KHz 100) WPC stands for a) Wireless Planning and Coordination b) Wireless Placement cell c) Wireless Planning cell d) Wireless Placement and Coordination *************************

1. Farad is a unit of (a) Resistance (b) Inductance (c) Capacitance. (d) Frequency.

1. Farad is a unit of (a) Resistance (b) Inductance (c) Capacitance. (d) Frequency. Department of Examinations, Sri Lanka EXAMINATION FOR THE AMATEUR RADIO OPERATORS CERTIFICATE OF PROFICENCY ISSUED BY THE DIRECTOR GENERAL OF TELECOMMUNICATIONS OF SRI LANKA (1998) (NOVICE CLASS) Basic